From 25edf4302f07a59a49324731e153977806ecb131 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Fri, 5 Nov 2010 23:22:45 +0000
Subject: [PATCH] When searching for an instantiated declaration requires
 instantiation of its parent context, be sure to update the parent-context
 pointer after instantiation. Fixes two anonymous-union instantiation issues
 in <rdar://problem/8635664>.

llvm-svn: 118313
---
 .../lib/Sema/SemaTemplateInstantiateDecl.cpp  |  2 ++
 clang/test/SemaTemplate/anonymous-union.cpp   | 21 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 6e352e71ef65..a594e678d6ce 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -2753,6 +2753,8 @@ NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
         if (!Tag->isBeingDefined() &&
             RequireCompleteType(Loc, T, diag::err_incomplete_type))
           return 0;
+
+        ParentDC = Tag->getDecl();
       }
     }
 
diff --git a/clang/test/SemaTemplate/anonymous-union.cpp b/clang/test/SemaTemplate/anonymous-union.cpp
index 59d1f25a4fd2..97ecd6e60cca 100644
--- a/clang/test/SemaTemplate/anonymous-union.cpp
+++ b/clang/test/SemaTemplate/anonymous-union.cpp
@@ -17,3 +17,24 @@ struct T1 : public T0, public T {
 struct A : public T0 { };
 
 void f1(T1<A> *S) { S->f0(); } // expected-note{{instantiation of member function}}
+
+namespace rdar8635664 {
+  template<typename T>
+  struct X {
+    struct inner;
+  
+    struct inner {
+      union {
+        int x;
+        float y;
+      };
+
+      typedef T type;
+    };
+  };
+
+  void test() {
+    X<int>::inner i;
+    i.x = 0;
+  }
+}